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Summary

Trust the best-selling Official Cert Guide series from Cisco Press to help you learn, prepare, and practice for exam success. They are built with the objective of providing assessment, review, and practice to help ensure you are fully prepared for your certification exam.

CCENT/CCNA ICND1 100-105 Official Cert Guide presents you with an organized test-preparation routine through the use of proven series elements and techniques. “Do I Know This Already?” quizzes open each chapter and enable you to decide how much time you need to spend on each section. Exam topic lists make referencing easy. Chapter-ending Exam Preparation Tasks help you drill on key concepts you must know thoroughly.

· Master Cisco CCENT/CCNA ICND1 100-105 exam topics

· Assess your knowledge with chapter-opening quizzes

· Review key concepts with exam preparation tasks

· Practice with realistic exam questions on the CD-ROM

CCENT/CCNA ICND1 100-105 Official Cert Guide from Cisco Press enables you to succeed on the exam the first time and is the only self-study resource approved by Cisco.

· A free copy of the CCENT ICND1 100-105 Network Simulator Lite software, complete with meaningful lab exercises that help you hone your hands-on skills with the command-line interface for routers and switches

· A final preparation chapter, which guides you through tools and resources to help you craft your review and test-taking strategies

· Study plan suggestions and templates to help you organize and optimize your study time

Well regarded for its level of detail, study plans, assessment features, challenging review questions and exercises, video instruction, and hands-on labs, this official study guide helps you master the concepts and techniques that ensure your exam success.

This official study guide helps you master all the topics on the CCENT/CCNA ICND1 exam, including

Includes Exclusive Offer for 70% Off Premium Edition eBook and Practice Test

Also available from Cisco Press for CCENT/CCNA study is the CCENT/CCNA ICND1 100-105 Official Cert GuidePremium Edition eBook and Practice Test. This digital-only certification preparation product combines an eBook with enhanced Pearson IT Certification Practice Test.

This integrated learning package

· Enables you to focus on individual topic areas or take complete, timed exams

· Includes direct links from each question to detailed tutorials to help you understand the concepts behind the questions

· Provides unique sets of exam-realistic practice questions

· Tracks your performance and provides feedback on a module-by-module basis, laying out a complete assessment of your knowledge to help you focus your study where it is needed most

Author Biography

Wendell Odom, CCIE No. 1624 (Emeritus), has been in the networking industry since 1981. He has worked as a network engineer, consultant, systems engineer, instructor, and course developer; he currently works writing and creating certification study tools. This book is his 27th edition of some product for Pearson, and he is the author of all editions of the CCNA R&S and CCENT Cert Guides from Cisco Press. He has written books about topics from networking basics, certification guides throughout the years for CCENT, CCNA R&S, CCNA DC, CCNP ROUTE, CCNP QoS, and CCIE R&S. He helped develop the popular Pearson Network Simulator. He maintains study tools, links to his blogs, and other resources at www.certskills.com.

Table of Contents

Introduction xxxiv

Your Study Plan 2

Part I Networking Fundamentals 13

Chapter 1 Introduction to TCP/IP Networking 14

“Do I Know This Already?” Quiz 14

Foundation Topics 17

Perspectives on Networking 17

TCP/IP Networking Model 18

History Leading to TCP/IP 19

Overview of the TCP/IP Networking Model 20

TCP/IP Application Layer 22

TCP/IP Transport Layer 23

TCP/IP Network Layer 25

TCP/IP Link Layer (Data Link Plus Physical) 28

TCP/IP Model and Terminology 30

OSI Networking Model 32

Comparing OSI and TCP/IP 32

Describing Protocols by Referencing the OSI Layers 33

OSI Layers and Their Functions 33

OSI Layering Concepts and Benefits 35

OSI Encapsulation Terminology 35

Chapter 2 Fundamentals of Ethernet LANs 38

“Do I Know This Already?” Quiz 38

Foundation Topics 40

An Overview of LANs 40

Typical SOHO LANs 41

Typical Enterprise LANs 42

The Variety of Ethernet Physical Layer Standards 43

Consistent Behavior over All Links Using the Ethernet Data Link Layer 44

Building Physical Ethernet Networks with UTP 45

Transmitting Data Using Twisted Pairs 45

Breaking Down a UTP Ethernet Link 46

UTP Cabling Pinouts for 10BASE-T and 100BASE-T 48

UTP Cabling Pinouts for 1000BASE-T 51

Sending Data in Ethernet Networks 51

Ethernet Data-Link Protocols 51

Sending Ethernet Frames with Switches and Hubs 55

Chapter 3 Fundamentals of WANs 60

“Do I Know This Already?” Quiz 60

Foundation Topics 62

Leased-Line WANs 62

Positioning Leased Lines with LANs and Routers 62

Physical Details of Leased Lines 63

Data-Link Details of Leased Lines 66

Ethernet as a WAN Technology 69

Ethernet WANs that Create a Layer 2 Service 70

How Routers Route IP Packets Using Ethernet Emulation 71

Accessing the Internet 72

The Internet as a Large WAN 72

Internet Access (WAN) Links 73

Digital Subscriber Line 74

Cable Internet 76

Chapter 4 Fundamentals of IPv4 Addressing and Routing 78

“Do I Know This Already?” Quiz 78

Foundation Topics 81

Overview of Network Layer Functions 81

Network Layer Routing (Forwarding) Logic 81

How Network Layer Routing Uses LANs and WANs 83

IP Addressing and How Addressing Helps IP Routing 84

Routing Protocols 85

IPv4 Addressing 86

Rules for IP Addresses 86

Rules for Grouping IP Addresses 87

IP Subnetting 91

IPv4 Routing 93

IPv4 Host Routing 93

Router Forwarding Decisions and the IP Routing Table 94

IPv4 Routing Protocols 96

Other Network Layer Features 98

Using Names and the Domain Name System 98

The Address Resolution Protocol 99

ICMP Echo and the ping Command 100

Chapter 5 Fundamentals of TCP/IP Transport and Applications 102

“Do I Know This Already?” Quiz 102

Foundation Topics 104

TCP/IP Layer 4 Protocols: TCP and UDP 104

Transmission Control Protocol 105

User Datagram Protocol 113

TCP/IP Applications 114

Uniform Resource Identifiers 114

Finding the Web Server Using DNS 115

Transferring Files with HTTP 117

How the Receiving Host Identifies the Correct Receiving Application 118

Part I Review 120

Part II Implementing Basic Ethernet LANs 125

Chapter 6 Using the Command-Line Interface 126

“Do I Know This Already?” Quiz 126

Foundation Topics 128

Accessing the Cisco Catalyst Switch CLI 128

Cisco Catalyst Switches 128

Accessing the Cisco IOS CLI 129

CLI Help Features 136

The debug and show Commands 137

Configuring Cisco IOS Software 138

Configuration Submodes and Contexts 139

Storing Switch Configuration Files 141

Copying and Erasing Configuration Files 143

Chapter 7 Analyzing Ethernet LAN Switching 146

“Do I Know This Already?” Quiz 146

Foundation Topics 148

LAN Switching Concepts 148

Overview of Switching Logic 149

Forwarding Known Unicast Frames 150

Learning MAC Addresses 153

Flooding Unknown Unicast and Broadcast Frames 154

Avoiding Loops Using Spanning Tree Protocol 154

LAN Switching Summary 155

Verifying and Analyzing Ethernet Switching 156

Demonstrating MAC Learning 156

Switch Interfaces 158

Finding Entries in the MAC Address Table 159

Managing the MAC Address Table (Aging, Clearing) 161

MAC Address Tables with Multiple Switches 162

Chapter 8 Configuring Basic Switch Management 166

“Do I Know This Already?” Quiz 166

Foundation Topics 168

Securing the Switch CLI 168

Securing User Mode and Privileged Mode with Simple Passwords 169

Securing User Mode Access with Local Usernames and Passwords 173

Securing User Mode Access with External Authentication Servers 175

Securing Remote Access with Secure Shell 176

Enabling IPv4 for Remote Access 179

Host and Switch IP Settings 179

Configuring IPv4 on a Switch 181

Configuring a Switch to Learn Its IP Address with DHCP 182

Verifying IPv4 on a Switch 183

Miscellaneous Settings Useful in Lab 184

History Buffer Commands 184

The logging synchronous, exec-timeout, and no ip domain-lookup Commands 184